opalrb

There's opal-irb and opal-jquery and vienna but is there any way to use gems directly in the browser via Opal? You can add a gem's lib path to Opal load paths by using Opal.use_gem Common pitfalls are: use of String mutability relying on the difference between String and Symbol shelling out ( `` and %x{} ) Available tools to fix/workaround some of those issues are: stubbing files Opal::Processor.stub_file('fileutils') hiding code branches at compile time using RUBY_ENGINE , example: unless RUBY_ENGINE == 'opal' unparsable/breaking code here end You can look at the opal-rspec source code to see

I'm working on a piece of logic that I would like to express on the server as well as in the browser. Something like validating a form where there must be certain logical relationships between the elements based on what has already been entered. So... If I can write the logic once and somehow end up with both Ruby and with Javascript, I can write the logic just once and not have to worry about making sure that two pieces of code written in different languages have the same functional behaviour. I don't need to reproduce everything in Ruby, obviously, and one simplification might be to port a

Closed . This question is opinion-based. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it can be answered with facts and citations by editing this post . I'm very keen to try Opal in a new Rails project, but the risk of course is that I won't discover what it can't do until I've spent hundreds of hours doing everything else, and run into a brick wall that I can't possibly get through. What are its limitations? For example (and of course answers should not be limited to these topics if there are other limitations worth mentioning) I